New
New
Year 5

Estimate and multiply a 2-digit by a 1-digit number using expanded and short multiplication

I can use expanded and short multiplication to multiply 2-digit by 1-digit numbers.

New
New
Year 5

Estimate and multiply a 2-digit by a 1-digit number using expanded and short multiplication

I can use expanded and short multiplication to multiply 2-digit by 1-digit numbers.

Share activities with pupils
Share function coming soon...

Lesson details

Key learning points

  1. Use times tables and place value to estimate the product of a 2-digit by a 1-digit multiplication.
  2. Use expanded short multiplication to multiply a 2-digit by a 1-digit number.
  3. Use short multiplication to multiply a 2-digit by a 1-digit number.

Common misconception

Pupils may find it difficult to identify the multiples of 10 a number is between when estimating.

Provide a number line and continue to use stem sentences to support pupils in their thinking.

Keywords

  • Estimation - To find a value that is close enough to the right answer, usually with some thought or calculation involved is known as estimation.

Estimation is a key skill and should be modelled clearly, with pupils encouraged to use estimation at every opportunity. Take time to model your 'thinking aloud' process while estimating.
Teacher tip

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

Video

Loading...

6 Questions

Q1.
483 can be partitioned as __________.
4 tens, 8 tens and 3 ones.
4 hundreds, 7 tens and 3 ones.
Correct answer: 4 hundreds, 8 tens and 3 ones.
4 hundreds, 80 tens and 3 ones.
Q2.
Izzy is chanting her 7 times tables: ... 21, 28, 35, ___. What comes next?
40
41
Correct answer: 42
43
Q3.
Izzy is chanting her 7 times tables in descending order: ... 77, 70, 63, . What comes next?
Correct Answer: 56, fifty-six, Fifty-six, Fifty six
Q4.
Use short multiplication to calculate this question: 56 × 3 =
Correct Answer: 168, one hundred and sixty eight, One hundred and sixty eight
Q5.
Use expanded multiplication to calculate this question: 74 × 5=
Correct Answer: 370, Three hundred and seventy, three hundred and seventy
Q6.
Sam has 71 shiny cards, Izzy has 213 shiny cards. Izzy has times as many.
Correct Answer: 3, three, Three

6 Questions

Q1.
To estimate for the calculation: 4 × 72, 72 is between __________.
60 and 70
Correct answer: 70 and 80
65 and 70
Q2.
Select the correct number to complete the estimation.
An image in a quiz
28
74
208
Correct answer: 280
Q3.
Write the correct number to complete the estimation.
An image in a quiz
Correct Answer: 360, Three hundred and sixty, three hundred and sixty
Q4.
Select an appropriate estimation for 63 × 3
65 × 3
Correct answer: 60 × 3
70 × 3
6 × 3
Q5.
Use estimation to decide which has a suitable answer for this multiplication: 46 × 3
An image in a quiz
Correct answer: A
B
Q6.
Solve the worded problem using short multiplication: In one month 34 cups of lemonade are sold. The following month, six times as many are sold. How many cups of lemonade were sold that month?
Correct Answer: 204, 204 cups, Two hundred and four, Two hundred and four cups, two hundred and four cups